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[Paparazzi-devel] Barometre settings with Lisa/M

From: Jorn Anke
Subject: [Paparazzi-devel] Barometre settings with Lisa/M
Date: Sat, 16 Nov 2013 23:19:18 +0100


I have a Lisa/M 2.0 with an onboard aspirin. I would like to use the aspirin baro, since I believe this would grately improve the precision of vertical possition.

In my airframe-file, my firmware-settings looks like this:

<firmware      name = "fixedwing">
    <target      name = "ap"                       board = "lisa_m_2.0">
      <configure name = "LISA_M_BARO"              value = "BARO_MS5611_SPI"/>
      <configure name = "USE_BARO_BOARD"           value = "TRUE"/>
      <configure name = "PERIODIC_FREQUENCY"       value = "120"/>
      <configure name = "AHRS_PROPAGATE_FREQUENCY" value = "100"/>
      <configure name = "AHRS_CORRECT_FREQUENCY"   value = "100"/>
      <define    name = "AHRS_TRIGGERED_ATTITUDE_LOOP"/>
    <target      name = "sim"              board = "pc"/>
    <define      name = "USE_MAGNETOMETER" value = "FALSE"/>
    <subsystem   name = "radio_control"    type  = "ppm"/>
    <subsystem   name = "telemetry"        type  = "transparent"/>
    <subsystem   name = "control"/>
    <subsystem   name = "imu"              type  = "aspirin_v2.1"/>
    <subsystem   name = "ahrs"             type  = "float_dcm"/>
    <subsystem   name = "gps"              type  = "ublox"/>
    <subsystem   name = "navigation"/>
    <subsystem   name = "ins"              type  = "alt_float"/>

I am using latest master.

The Lisa/M has now been running for about an hour on my terrasse. Reported horisontal accuracy is about 2.5m most of the time. Vertical possition has however been drifting +- 10m, (which is what I would expect from the gps alone).

I therefore believe the baro is currently not involved in giving the vertical possition. So, my question is if need to change anything in my settings to have the baro working properly? (Couldn't find much on this on the wiki).

Btw; which AHRS subsystem would YOU have selected for a slow-flying/stable fixed-wing airframe intended for aerial photography?



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